sd/dhcp: workaround multiple "Domain Name" (option 15) entries

https://mail.gnome.org/archives/networkmanager-list/2005-April/msg00022.html
https://tools.ietf.org/html/rfc2132#section-3.17
https://bugzilla.gnome.org/show_bug.cgi?id=766191

src/dhcp-manager/nm-dhcp-systemd.c

@@ -279,8 +279,9 @@ lease_to_ip4_config (const char *iface,
 	/* Domain Name */
 	r = sd_dhcp_lease_get_domainname (lease, &str);
 	if (r == 0) {
-		/* Multiple domains sometimes stuffed into the option */
-		char **domains = g_strsplit (str, " ", 0);
+		/* Multiple domains sometimes stuffed into option 15 "Domain Name".
+		 * As systemd escapes such characters, split them at \\032. */
+		char **domains = g_strsplit (str, "\\032", 0);
 		char **s;
 
 		for (s = domains; *s; s++) {